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ipvs: Pass ipvs not net to ip_vs_estimator_net_init and ip_vs_estimator_cleanup
[deliverable/linux.git] / net / netfilter / ipvs / ip_vs_sync.c
1 /*
2 * IPVS An implementation of the IP virtual server support for the
3 * LINUX operating system. IPVS is now implemented as a module
4 * over the NetFilter framework. IPVS can be used to build a
5 * high-performance and highly available server based on a
6 * cluster of servers.
7 *
8 * Version 1, is capable of handling both version 0 and 1 messages.
9 * Version 0 is the plain old format.
10 * Note Version 0 receivers will just drop Ver 1 messages.
11 * Version 1 is capable of handle IPv6, Persistence data,
12 * time-outs, and firewall marks.
13 * In ver.1 "ip_vs_sync_conn_options" will be sent in netw. order.
14 * Ver. 0 can be turned on by sysctl -w net.ipv4.vs.sync_version=0
15 *
16 * Definitions Message: is a complete datagram
17 * Sync_conn: is a part of a Message
18 * Param Data is an option to a Sync_conn.
19 *
20 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
21 *
22 * ip_vs_sync: sync connection info from master load balancer to backups
23 * through multicast
24 *
25 * Changes:
26 * Alexandre Cassen : Added master & backup support at a time.
27 * Alexandre Cassen : Added SyncID support for incoming sync
28 * messages filtering.
29 * Justin Ossevoort : Fix endian problem on sync message size.
30 * Hans Schillstrom : Added Version 1: i.e. IPv6,
31 * Persistence support, fwmark and time-out.
32 */
33
34 #define KMSG_COMPONENT "IPVS"
35 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
36
37 #include <linux/module.h>
38 #include <linux/slab.h>
39 #include <linux/inetdevice.h>
40 #include <linux/net.h>
41 #include <linux/completion.h>
42 #include <linux/delay.h>
43 #include <linux/skbuff.h>
44 #include <linux/in.h>
45 #include <linux/igmp.h> /* for ip_mc_join_group */
46 #include <linux/udp.h>
47 #include <linux/err.h>
48 #include <linux/kthread.h>
49 #include <linux/wait.h>
50 #include <linux/kernel.h>
51
52 #include <asm/unaligned.h> /* Used for ntoh_seq and hton_seq */
53
54 #include <net/ip.h>
55 #include <net/sock.h>
56
57 #include <net/ip_vs.h>
58
59 #define IP_VS_SYNC_GROUP 0xe0000051 /* multicast addr - 224.0.0.81 */
60 #define IP_VS_SYNC_PORT 8848 /* multicast port */
61
62 #define SYNC_PROTO_VER 1 /* Protocol version in header */
63
64 static struct lock_class_key __ipvs_sync_key;
65 /*
66 * IPVS sync connection entry
67 * Version 0, i.e. original version.
68 */
69 struct ip_vs_sync_conn_v0 {
70 __u8 reserved;
71
72 /* Protocol, addresses and port numbers */
73 __u8 protocol; /* Which protocol (TCP/UDP) */
74 __be16 cport;
75 __be16 vport;
76 __be16 dport;
77 __be32 caddr; /* client address */
78 __be32 vaddr; /* virtual address */
79 __be32 daddr; /* destination address */
80
81 /* Flags and state transition */
82 __be16 flags; /* status flags */
83 __be16 state; /* state info */
84
85 /* The sequence options start here */
86 };
87
88 struct ip_vs_sync_conn_options {
89 struct ip_vs_seq in_seq; /* incoming seq. struct */
90 struct ip_vs_seq out_seq; /* outgoing seq. struct */
91 };
92
93 /*
94 Sync Connection format (sync_conn)
95
96 0 1 2 3
97 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
98 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
99 | Type | Protocol | Ver. | Size |
100 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
101 | Flags |
102 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
103 | State | cport |
104 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
105 | vport | dport |
106 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
107 | fwmark |
108 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
109 | timeout (in sec.) |
110 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
111 | ... |
112 | IP-Addresses (v4 or v6) |
113 | ... |
114 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
115 Optional Parameters.
116 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
117 | Param. Type | Param. Length | Param. data |
118 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
119 | ... |
120 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
121 | | Param Type | Param. Length |
122 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
123 | Param data |
124 | Last Param data should be padded for 32 bit alignment |
125 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
126 */
127
128 /*
129 * Type 0, IPv4 sync connection format
130 */
131 struct ip_vs_sync_v4 {
132 __u8 type;
133 __u8 protocol; /* Which protocol (TCP/UDP) */
134 __be16 ver_size; /* Version msb 4 bits */
135 /* Flags and state transition */
136 __be32 flags; /* status flags */
137 __be16 state; /* state info */
138 /* Protocol, addresses and port numbers */
139 __be16 cport;
140 __be16 vport;
141 __be16 dport;
142 __be32 fwmark; /* Firewall mark from skb */
143 __be32 timeout; /* cp timeout */
144 __be32 caddr; /* client address */
145 __be32 vaddr; /* virtual address */
146 __be32 daddr; /* destination address */
147 /* The sequence options start here */
148 /* PE data padded to 32bit alignment after seq. options */
149 };
150 /*
151 * Type 2 messages IPv6
152 */
153 struct ip_vs_sync_v6 {
154 __u8 type;
155 __u8 protocol; /* Which protocol (TCP/UDP) */
156 __be16 ver_size; /* Version msb 4 bits */
157 /* Flags and state transition */
158 __be32 flags; /* status flags */
159 __be16 state; /* state info */
160 /* Protocol, addresses and port numbers */
161 __be16 cport;
162 __be16 vport;
163 __be16 dport;
164 __be32 fwmark; /* Firewall mark from skb */
165 __be32 timeout; /* cp timeout */
166 struct in6_addr caddr; /* client address */
167 struct in6_addr vaddr; /* virtual address */
168 struct in6_addr daddr; /* destination address */
169 /* The sequence options start here */
170 /* PE data padded to 32bit alignment after seq. options */
171 };
172
173 union ip_vs_sync_conn {
174 struct ip_vs_sync_v4 v4;
175 struct ip_vs_sync_v6 v6;
176 };
177
178 /* Bits in Type field in above */
179 #define STYPE_INET6 0
180 #define STYPE_F_INET6 (1 << STYPE_INET6)
181
182 #define SVER_SHIFT 12 /* Shift to get version */
183 #define SVER_MASK 0x0fff /* Mask to strip version */
184
185 #define IPVS_OPT_SEQ_DATA 1
186 #define IPVS_OPT_PE_DATA 2
187 #define IPVS_OPT_PE_NAME 3
188 #define IPVS_OPT_PARAM 7
189
190 #define IPVS_OPT_F_SEQ_DATA (1 << (IPVS_OPT_SEQ_DATA-1))
191 #define IPVS_OPT_F_PE_DATA (1 << (IPVS_OPT_PE_DATA-1))
192 #define IPVS_OPT_F_PE_NAME (1 << (IPVS_OPT_PE_NAME-1))
193 #define IPVS_OPT_F_PARAM (1 << (IPVS_OPT_PARAM-1))
194
195 struct ip_vs_sync_thread_data {
196 struct netns_ipvs *ipvs;
197 struct socket *sock;
198 char *buf;
199 int id;
200 };
201
202 /* Version 0 definition of packet sizes */
203 #define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn_v0))
204 #define FULL_CONN_SIZE \
205 (sizeof(struct ip_vs_sync_conn_v0) + sizeof(struct ip_vs_sync_conn_options))
206
207
208 /*
209 The master mulitcasts messages (Datagrams) to the backup load balancers
210 in the following format.
211
212 Version 1:
213 Note, first byte should be Zero, so ver 0 receivers will drop the packet.
214
215 0 1 2 3
216 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
217 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
218 | 0 | SyncID | Size |
219 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
220 | Count Conns | Version | Reserved, set to Zero |
221 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
222 | |
223 | IPVS Sync Connection (1) |
224 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
225 | . |
226 ~ . ~
227 | . |
228 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
229 | |
230 | IPVS Sync Connection (n) |
231 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
232
233 Version 0 Header
234 0 1 2 3
235 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
236 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
237 | Count Conns | SyncID | Size |
238 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
239 | IPVS Sync Connection (1) |
240 */
241
242 #define SYNC_MESG_HEADER_LEN 4
243 #define MAX_CONNS_PER_SYNCBUFF 255 /* nr_conns in ip_vs_sync_mesg is 8 bit */
244
245 /* Version 0 header */
246 struct ip_vs_sync_mesg_v0 {
247 __u8 nr_conns;
248 __u8 syncid;
249 __be16 size;
250
251 /* ip_vs_sync_conn entries start here */
252 };
253
254 /* Version 1 header */
255 struct ip_vs_sync_mesg {
256 __u8 reserved; /* must be zero */
257 __u8 syncid;
258 __be16 size;
259 __u8 nr_conns;
260 __s8 version; /* SYNC_PROTO_VER */
261 __u16 spare;
262 /* ip_vs_sync_conn entries start here */
263 };
264
265 union ipvs_sockaddr {
266 struct sockaddr_in in;
267 struct sockaddr_in6 in6;
268 };
269
270 struct ip_vs_sync_buff {
271 struct list_head list;
272 unsigned long firstuse;
273
274 /* pointers for the message data */
275 struct ip_vs_sync_mesg *mesg;
276 unsigned char *head;
277 unsigned char *end;
278 };
279
280 /*
281 * Copy of struct ip_vs_seq
282 * From unaligned network order to aligned host order
283 */
284 static void ntoh_seq(struct ip_vs_seq *no, struct ip_vs_seq *ho)
285 {
286 ho->init_seq = get_unaligned_be32(&no->init_seq);
287 ho->delta = get_unaligned_be32(&no->delta);
288 ho->previous_delta = get_unaligned_be32(&no->previous_delta);
289 }
290
291 /*
292 * Copy of struct ip_vs_seq
293 * From Aligned host order to unaligned network order
294 */
295 static void hton_seq(struct ip_vs_seq *ho, struct ip_vs_seq *no)
296 {
297 put_unaligned_be32(ho->init_seq, &no->init_seq);
298 put_unaligned_be32(ho->delta, &no->delta);
299 put_unaligned_be32(ho->previous_delta, &no->previous_delta);
300 }
301
302 static inline struct ip_vs_sync_buff *
303 sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
304 {
305 struct ip_vs_sync_buff *sb;
306
307 spin_lock_bh(&ipvs->sync_lock);
308 if (list_empty(&ms->sync_queue)) {
309 sb = NULL;
310 __set_current_state(TASK_INTERRUPTIBLE);
311 } else {
312 sb = list_entry(ms->sync_queue.next, struct ip_vs_sync_buff,
313 list);
314 list_del(&sb->list);
315 ms->sync_queue_len--;
316 if (!ms->sync_queue_len)
317 ms->sync_queue_delay = 0;
318 }
319 spin_unlock_bh(&ipvs->sync_lock);
320
321 return sb;
322 }
323
324 /*
325 * Create a new sync buffer for Version 1 proto.
326 */
327 static inline struct ip_vs_sync_buff *
328 ip_vs_sync_buff_create(struct netns_ipvs *ipvs, unsigned int len)
329 {
330 struct ip_vs_sync_buff *sb;
331
332 if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
333 return NULL;
334
335 len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg),
336 ipvs->mcfg.sync_maxlen);
337 sb->mesg = kmalloc(len, GFP_ATOMIC);
338 if (!sb->mesg) {
339 kfree(sb);
340 return NULL;
341 }
342 sb->mesg->reserved = 0; /* old nr_conns i.e. must be zero now */
343 sb->mesg->version = SYNC_PROTO_VER;
344 sb->mesg->syncid = ipvs->mcfg.syncid;
345 sb->mesg->size = htons(sizeof(struct ip_vs_sync_mesg));
346 sb->mesg->nr_conns = 0;
347 sb->mesg->spare = 0;
348 sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg);
349 sb->end = (unsigned char *)sb->mesg + len;
350
351 sb->firstuse = jiffies;
352 return sb;
353 }
354
355 static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb)
356 {
357 kfree(sb->mesg);
358 kfree(sb);
359 }
360
361 static inline void sb_queue_tail(struct netns_ipvs *ipvs,
362 struct ipvs_master_sync_state *ms)
363 {
364 struct ip_vs_sync_buff *sb = ms->sync_buff;
365
366 spin_lock(&ipvs->sync_lock);
367 if (ipvs->sync_state & IP_VS_STATE_MASTER &&
368 ms->sync_queue_len < sysctl_sync_qlen_max(ipvs)) {
369 if (!ms->sync_queue_len)
370 schedule_delayed_work(&ms->master_wakeup_work,
371 max(IPVS_SYNC_SEND_DELAY, 1));
372 ms->sync_queue_len++;
373 list_add_tail(&sb->list, &ms->sync_queue);
374 if ((++ms->sync_queue_delay) == IPVS_SYNC_WAKEUP_RATE)
375 wake_up_process(ms->master_thread);
376 } else
377 ip_vs_sync_buff_release(sb);
378 spin_unlock(&ipvs->sync_lock);
379 }
380
381 /*
382 * Get the current sync buffer if it has been created for more
383 * than the specified time or the specified time is zero.
384 */
385 static inline struct ip_vs_sync_buff *
386 get_curr_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms,
387 unsigned long time)
388 {
389 struct ip_vs_sync_buff *sb;
390
391 spin_lock_bh(&ipvs->sync_buff_lock);
392 sb = ms->sync_buff;
393 if (sb && time_after_eq(jiffies - sb->firstuse, time)) {
394 ms->sync_buff = NULL;
395 __set_current_state(TASK_RUNNING);
396 } else
397 sb = NULL;
398 spin_unlock_bh(&ipvs->sync_buff_lock);
399 return sb;
400 }
401
402 static inline int
403 select_master_thread_id(struct netns_ipvs *ipvs, struct ip_vs_conn *cp)
404 {
405 return ((long) cp >> (1 + ilog2(sizeof(*cp)))) & ipvs->threads_mask;
406 }
407
408 /*
409 * Create a new sync buffer for Version 0 proto.
410 */
411 static inline struct ip_vs_sync_buff *
412 ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs, unsigned int len)
413 {
414 struct ip_vs_sync_buff *sb;
415 struct ip_vs_sync_mesg_v0 *mesg;
416
417 if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
418 return NULL;
419
420 len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg_v0),
421 ipvs->mcfg.sync_maxlen);
422 sb->mesg = kmalloc(len, GFP_ATOMIC);
423 if (!sb->mesg) {
424 kfree(sb);
425 return NULL;
426 }
427 mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg;
428 mesg->nr_conns = 0;
429 mesg->syncid = ipvs->mcfg.syncid;
430 mesg->size = htons(sizeof(struct ip_vs_sync_mesg_v0));
431 sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0);
432 sb->end = (unsigned char *)mesg + len;
433 sb->firstuse = jiffies;
434 return sb;
435 }
436
437 /* Check if connection is controlled by persistence */
438 static inline bool in_persistence(struct ip_vs_conn *cp)
439 {
440 for (cp = cp->control; cp; cp = cp->control) {
441 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
442 return true;
443 }
444 return false;
445 }
446
447 /* Check if conn should be synced.
448 * pkts: conn packets, use sysctl_sync_threshold to avoid packet check
449 * - (1) sync_refresh_period: reduce sync rate. Additionally, retry
450 * sync_retries times with period of sync_refresh_period/8
451 * - (2) if both sync_refresh_period and sync_period are 0 send sync only
452 * for state changes or only once when pkts matches sync_threshold
453 * - (3) templates: rate can be reduced only with sync_refresh_period or
454 * with (2)
455 */
456 static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs,
457 struct ip_vs_conn *cp, int pkts)
458 {
459 unsigned long orig = ACCESS_ONCE(cp->sync_endtime);
460 unsigned long now = jiffies;
461 unsigned long n = (now + cp->timeout) & ~3UL;
462 unsigned int sync_refresh_period;
463 int sync_period;
464 int force;
465
466 /* Check if we sync in current state */
467 if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE))
468 force = 0;
469 else if (unlikely(sysctl_sync_persist_mode(ipvs) && in_persistence(cp)))
470 return 0;
471 else if (likely(cp->protocol == IPPROTO_TCP)) {
472 if (!((1 << cp->state) &
473 ((1 << IP_VS_TCP_S_ESTABLISHED) |
474 (1 << IP_VS_TCP_S_FIN_WAIT) |
475 (1 << IP_VS_TCP_S_CLOSE) |
476 (1 << IP_VS_TCP_S_CLOSE_WAIT) |
477 (1 << IP_VS_TCP_S_TIME_WAIT))))
478 return 0;
479 force = cp->state != cp->old_state;
480 if (force && cp->state != IP_VS_TCP_S_ESTABLISHED)
481 goto set;
482 } else if (unlikely(cp->protocol == IPPROTO_SCTP)) {
483 if (!((1 << cp->state) &
484 ((1 << IP_VS_SCTP_S_ESTABLISHED) |
485 (1 << IP_VS_SCTP_S_SHUTDOWN_SENT) |
486 (1 << IP_VS_SCTP_S_SHUTDOWN_RECEIVED) |
487 (1 << IP_VS_SCTP_S_SHUTDOWN_ACK_SENT) |
488 (1 << IP_VS_SCTP_S_CLOSED))))
489 return 0;
490 force = cp->state != cp->old_state;
491 if (force && cp->state != IP_VS_SCTP_S_ESTABLISHED)
492 goto set;
493 } else {
494 /* UDP or another protocol with single state */
495 force = 0;
496 }
497
498 sync_refresh_period = sysctl_sync_refresh_period(ipvs);
499 if (sync_refresh_period > 0) {
500 long diff = n - orig;
501 long min_diff = max(cp->timeout >> 1, 10UL * HZ);
502
503 /* Avoid sync if difference is below sync_refresh_period
504 * and below the half timeout.
505 */
506 if (abs(diff) < min_t(long, sync_refresh_period, min_diff)) {
507 int retries = orig & 3;
508
509 if (retries >= sysctl_sync_retries(ipvs))
510 return 0;
511 if (time_before(now, orig - cp->timeout +
512 (sync_refresh_period >> 3)))
513 return 0;
514 n |= retries + 1;
515 }
516 }
517 sync_period = sysctl_sync_period(ipvs);
518 if (sync_period > 0) {
519 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) &&
520 pkts % sync_period != sysctl_sync_threshold(ipvs))
521 return 0;
522 } else if (sync_refresh_period <= 0 &&
523 pkts != sysctl_sync_threshold(ipvs))
524 return 0;
525
526 set:
527 cp->old_state = cp->state;
528 n = cmpxchg(&cp->sync_endtime, orig, n);
529 return n == orig || force;
530 }
531
532 /*
533 * Version 0 , could be switched in by sys_ctl.
534 * Add an ip_vs_conn information into the current sync_buff.
535 */
536 static void ip_vs_sync_conn_v0(struct netns_ipvs *ipvs, struct ip_vs_conn *cp,
537 int pkts)
538 {
539 struct ip_vs_sync_mesg_v0 *m;
540 struct ip_vs_sync_conn_v0 *s;
541 struct ip_vs_sync_buff *buff;
542 struct ipvs_master_sync_state *ms;
543 int id;
544 unsigned int len;
545
546 if (unlikely(cp->af != AF_INET))
547 return;
548 /* Do not sync ONE PACKET */
549 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
550 return;
551
552 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
553 return;
554
555 spin_lock_bh(&ipvs->sync_buff_lock);
556 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
557 spin_unlock_bh(&ipvs->sync_buff_lock);
558 return;
559 }
560
561 id = select_master_thread_id(ipvs, cp);
562 ms = &ipvs->ms[id];
563 buff = ms->sync_buff;
564 len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
565 SIMPLE_CONN_SIZE;
566 if (buff) {
567 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
568 /* Send buffer if it is for v1 */
569 if (buff->head + len > buff->end || !m->nr_conns) {
570 sb_queue_tail(ipvs, ms);
571 ms->sync_buff = NULL;
572 buff = NULL;
573 }
574 }
575 if (!buff) {
576 buff = ip_vs_sync_buff_create_v0(ipvs, len);
577 if (!buff) {
578 spin_unlock_bh(&ipvs->sync_buff_lock);
579 pr_err("ip_vs_sync_buff_create failed.\n");
580 return;
581 }
582 ms->sync_buff = buff;
583 }
584
585 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
586 s = (struct ip_vs_sync_conn_v0 *) buff->head;
587
588 /* copy members */
589 s->reserved = 0;
590 s->protocol = cp->protocol;
591 s->cport = cp->cport;
592 s->vport = cp->vport;
593 s->dport = cp->dport;
594 s->caddr = cp->caddr.ip;
595 s->vaddr = cp->vaddr.ip;
596 s->daddr = cp->daddr.ip;
597 s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED);
598 s->state = htons(cp->state);
599 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
600 struct ip_vs_sync_conn_options *opt =
601 (struct ip_vs_sync_conn_options *)&s[1];
602 memcpy(opt, &cp->in_seq, sizeof(*opt));
603 }
604
605 m->nr_conns++;
606 m->size = htons(ntohs(m->size) + len);
607 buff->head += len;
608 spin_unlock_bh(&ipvs->sync_buff_lock);
609
610 /* synchronize its controller if it has */
611 cp = cp->control;
612 if (cp) {
613 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
614 pkts = atomic_add_return(1, &cp->in_pkts);
615 else
616 pkts = sysctl_sync_threshold(ipvs);
617 ip_vs_sync_conn(ipvs, cp, pkts);
618 }
619 }
620
621 /*
622 * Add an ip_vs_conn information into the current sync_buff.
623 * Called by ip_vs_in.
624 * Sending Version 1 messages
625 */
626 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts)
627 {
628 struct ip_vs_sync_mesg *m;
629 union ip_vs_sync_conn *s;
630 struct ip_vs_sync_buff *buff;
631 struct ipvs_master_sync_state *ms;
632 int id;
633 __u8 *p;
634 unsigned int len, pe_name_len, pad;
635
636 /* Handle old version of the protocol */
637 if (sysctl_sync_ver(ipvs) == 0) {
638 ip_vs_sync_conn_v0(ipvs, cp, pkts);
639 return;
640 }
641 /* Do not sync ONE PACKET */
642 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
643 goto control;
644 sloop:
645 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
646 goto control;
647
648 /* Sanity checks */
649 pe_name_len = 0;
650 if (cp->pe_data_len) {
651 if (!cp->pe_data || !cp->dest) {
652 IP_VS_ERR_RL("SYNC, connection pe_data invalid\n");
653 return;
654 }
655 pe_name_len = strnlen(cp->pe->name, IP_VS_PENAME_MAXLEN);
656 }
657
658 spin_lock_bh(&ipvs->sync_buff_lock);
659 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
660 spin_unlock_bh(&ipvs->sync_buff_lock);
661 return;
662 }
663
664 id = select_master_thread_id(ipvs, cp);
665 ms = &ipvs->ms[id];
666
667 #ifdef CONFIG_IP_VS_IPV6
668 if (cp->af == AF_INET6)
669 len = sizeof(struct ip_vs_sync_v6);
670 else
671 #endif
672 len = sizeof(struct ip_vs_sync_v4);
673
674 if (cp->flags & IP_VS_CONN_F_SEQ_MASK)
675 len += sizeof(struct ip_vs_sync_conn_options) + 2;
676
677 if (cp->pe_data_len)
678 len += cp->pe_data_len + 2; /* + Param hdr field */
679 if (pe_name_len)
680 len += pe_name_len + 2;
681
682 /* check if there is a space for this one */
683 pad = 0;
684 buff = ms->sync_buff;
685 if (buff) {
686 m = buff->mesg;
687 pad = (4 - (size_t) buff->head) & 3;
688 /* Send buffer if it is for v0 */
689 if (buff->head + len + pad > buff->end || m->reserved) {
690 sb_queue_tail(ipvs, ms);
691 ms->sync_buff = NULL;
692 buff = NULL;
693 pad = 0;
694 }
695 }
696
697 if (!buff) {
698 buff = ip_vs_sync_buff_create(ipvs, len);
699 if (!buff) {
700 spin_unlock_bh(&ipvs->sync_buff_lock);
701 pr_err("ip_vs_sync_buff_create failed.\n");
702 return;
703 }
704 ms->sync_buff = buff;
705 m = buff->mesg;
706 }
707
708 p = buff->head;
709 buff->head += pad + len;
710 m->size = htons(ntohs(m->size) + pad + len);
711 /* Add ev. padding from prev. sync_conn */
712 while (pad--)
713 *(p++) = 0;
714
715 s = (union ip_vs_sync_conn *)p;
716
717 /* Set message type & copy members */
718 s->v4.type = (cp->af == AF_INET6 ? STYPE_F_INET6 : 0);
719 s->v4.ver_size = htons(len & SVER_MASK); /* Version 0 */
720 s->v4.flags = htonl(cp->flags & ~IP_VS_CONN_F_HASHED);
721 s->v4.state = htons(cp->state);
722 s->v4.protocol = cp->protocol;
723 s->v4.cport = cp->cport;
724 s->v4.vport = cp->vport;
725 s->v4.dport = cp->dport;
726 s->v4.fwmark = htonl(cp->fwmark);
727 s->v4.timeout = htonl(cp->timeout / HZ);
728 m->nr_conns++;
729
730 #ifdef CONFIG_IP_VS_IPV6
731 if (cp->af == AF_INET6) {
732 p += sizeof(struct ip_vs_sync_v6);
733 s->v6.caddr = cp->caddr.in6;
734 s->v6.vaddr = cp->vaddr.in6;
735 s->v6.daddr = cp->daddr.in6;
736 } else
737 #endif
738 {
739 p += sizeof(struct ip_vs_sync_v4); /* options ptr */
740 s->v4.caddr = cp->caddr.ip;
741 s->v4.vaddr = cp->vaddr.ip;
742 s->v4.daddr = cp->daddr.ip;
743 }
744 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
745 *(p++) = IPVS_OPT_SEQ_DATA;
746 *(p++) = sizeof(struct ip_vs_sync_conn_options);
747 hton_seq((struct ip_vs_seq *)p, &cp->in_seq);
748 p += sizeof(struct ip_vs_seq);
749 hton_seq((struct ip_vs_seq *)p, &cp->out_seq);
750 p += sizeof(struct ip_vs_seq);
751 }
752 /* Handle pe data */
753 if (cp->pe_data_len && cp->pe_data) {
754 *(p++) = IPVS_OPT_PE_DATA;
755 *(p++) = cp->pe_data_len;
756 memcpy(p, cp->pe_data, cp->pe_data_len);
757 p += cp->pe_data_len;
758 if (pe_name_len) {
759 /* Add PE_NAME */
760 *(p++) = IPVS_OPT_PE_NAME;
761 *(p++) = pe_name_len;
762 memcpy(p, cp->pe->name, pe_name_len);
763 p += pe_name_len;
764 }
765 }
766
767 spin_unlock_bh(&ipvs->sync_buff_lock);
768
769 control:
770 /* synchronize its controller if it has */
771 cp = cp->control;
772 if (!cp)
773 return;
774 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
775 pkts = atomic_add_return(1, &cp->in_pkts);
776 else
777 pkts = sysctl_sync_threshold(ipvs);
778 goto sloop;
779 }
780
781 /*
782 * fill_param used by version 1
783 */
784 static inline int
785 ip_vs_conn_fill_param_sync(struct netns_ipvs *ipvs, int af, union ip_vs_sync_conn *sc,
786 struct ip_vs_conn_param *p,
787 __u8 *pe_data, unsigned int pe_data_len,
788 __u8 *pe_name, unsigned int pe_name_len)
789 {
790 #ifdef CONFIG_IP_VS_IPV6
791 if (af == AF_INET6)
792 ip_vs_conn_fill_param(ipvs, af, sc->v6.protocol,
793 (const union nf_inet_addr *)&sc->v6.caddr,
794 sc->v6.cport,
795 (const union nf_inet_addr *)&sc->v6.vaddr,
796 sc->v6.vport, p);
797 else
798 #endif
799 ip_vs_conn_fill_param(ipvs, af, sc->v4.protocol,
800 (const union nf_inet_addr *)&sc->v4.caddr,
801 sc->v4.cport,
802 (const union nf_inet_addr *)&sc->v4.vaddr,
803 sc->v4.vport, p);
804 /* Handle pe data */
805 if (pe_data_len) {
806 if (pe_name_len) {
807 char buff[IP_VS_PENAME_MAXLEN+1];
808
809 memcpy(buff, pe_name, pe_name_len);
810 buff[pe_name_len]=0;
811 p->pe = __ip_vs_pe_getbyname(buff);
812 if (!p->pe) {
813 IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n",
814 buff);
815 return 1;
816 }
817 } else {
818 IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n");
819 return 1;
820 }
821
822 p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC);
823 if (!p->pe_data) {
824 module_put(p->pe->module);
825 return -ENOMEM;
826 }
827 p->pe_data_len = pe_data_len;
828 }
829 return 0;
830 }
831
832 /*
833 * Connection Add / Update.
834 * Common for version 0 and 1 reception of backup sync_conns.
835 * Param: ...
836 * timeout is in sec.
837 */
838 static void ip_vs_proc_conn(struct netns_ipvs *ipvs, struct ip_vs_conn_param *param,
839 unsigned int flags, unsigned int state,
840 unsigned int protocol, unsigned int type,
841 const union nf_inet_addr *daddr, __be16 dport,
842 unsigned long timeout, __u32 fwmark,
843 struct ip_vs_sync_conn_options *opt)
844 {
845 struct ip_vs_dest *dest;
846 struct ip_vs_conn *cp;
847
848 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
849 cp = ip_vs_conn_in_get(param);
850 if (cp && ((cp->dport != dport) ||
851 !ip_vs_addr_equal(cp->daf, &cp->daddr, daddr))) {
852 if (!(flags & IP_VS_CONN_F_INACTIVE)) {
853 ip_vs_conn_expire_now(cp);
854 __ip_vs_conn_put(cp);
855 cp = NULL;
856 } else {
857 /* This is the expiration message for the
858 * connection that was already replaced, so we
859 * just ignore it.
860 */
861 __ip_vs_conn_put(cp);
862 kfree(param->pe_data);
863 return;
864 }
865 }
866 } else {
867 cp = ip_vs_ct_in_get(param);
868 }
869
870 if (cp) {
871 /* Free pe_data */
872 kfree(param->pe_data);
873
874 dest = cp->dest;
875 spin_lock_bh(&cp->lock);
876 if ((cp->flags ^ flags) & IP_VS_CONN_F_INACTIVE &&
877 !(flags & IP_VS_CONN_F_TEMPLATE) && dest) {
878 if (flags & IP_VS_CONN_F_INACTIVE) {
879 atomic_dec(&dest->activeconns);
880 atomic_inc(&dest->inactconns);
881 } else {
882 atomic_inc(&dest->activeconns);
883 atomic_dec(&dest->inactconns);
884 }
885 }
886 flags &= IP_VS_CONN_F_BACKUP_UPD_MASK;
887 flags |= cp->flags & ~IP_VS_CONN_F_BACKUP_UPD_MASK;
888 cp->flags = flags;
889 spin_unlock_bh(&cp->lock);
890 if (!dest)
891 ip_vs_try_bind_dest(cp);
892 } else {
893 /*
894 * Find the appropriate destination for the connection.
895 * If it is not found the connection will remain unbound
896 * but still handled.
897 */
898 rcu_read_lock();
899 /* This function is only invoked by the synchronization
900 * code. We do not currently support heterogeneous pools
901 * with synchronization, so we can make the assumption that
902 * the svc_af is the same as the dest_af
903 */
904 dest = ip_vs_find_dest(ipvs, type, type, daddr, dport,
905 param->vaddr, param->vport, protocol,
906 fwmark, flags);
907
908 cp = ip_vs_conn_new(param, type, daddr, dport, flags, dest,
909 fwmark);
910 rcu_read_unlock();
911 if (!cp) {
912 kfree(param->pe_data);
913 IP_VS_DBG(2, "BACKUP, add new conn. failed\n");
914 return;
915 }
916 if (!(flags & IP_VS_CONN_F_TEMPLATE))
917 kfree(param->pe_data);
918 }
919
920 if (opt)
921 memcpy(&cp->in_seq, opt, sizeof(*opt));
922 atomic_set(&cp->in_pkts, sysctl_sync_threshold(ipvs));
923 cp->state = state;
924 cp->old_state = cp->state;
925 /*
926 * For Ver 0 messages style
927 * - Not possible to recover the right timeout for templates
928 * - can not find the right fwmark
929 * virtual service. If needed, we can do it for
930 * non-fwmark persistent services.
931 * Ver 1 messages style.
932 * - No problem.
933 */
934 if (timeout) {
935 if (timeout > MAX_SCHEDULE_TIMEOUT / HZ)
936 timeout = MAX_SCHEDULE_TIMEOUT / HZ;
937 cp->timeout = timeout*HZ;
938 } else {
939 struct ip_vs_proto_data *pd;
940
941 pd = ip_vs_proto_data_get(ipvs, protocol);
942 if (!(flags & IP_VS_CONN_F_TEMPLATE) && pd && pd->timeout_table)
943 cp->timeout = pd->timeout_table[state];
944 else
945 cp->timeout = (3*60*HZ);
946 }
947 ip_vs_conn_put(cp);
948 }
949
950 /*
951 * Process received multicast message for Version 0
952 */
953 static void ip_vs_process_message_v0(struct netns_ipvs *ipvs, const char *buffer,
954 const size_t buflen)
955 {
956 struct ip_vs_sync_mesg_v0 *m = (struct ip_vs_sync_mesg_v0 *)buffer;
957 struct ip_vs_sync_conn_v0 *s;
958 struct ip_vs_sync_conn_options *opt;
959 struct ip_vs_protocol *pp;
960 struct ip_vs_conn_param param;
961 char *p;
962 int i;
963
964 p = (char *)buffer + sizeof(struct ip_vs_sync_mesg_v0);
965 for (i=0; i<m->nr_conns; i++) {
966 unsigned int flags, state;
967
968 if (p + SIMPLE_CONN_SIZE > buffer+buflen) {
969 IP_VS_ERR_RL("BACKUP v0, bogus conn\n");
970 return;
971 }
972 s = (struct ip_vs_sync_conn_v0 *) p;
973 flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC;
974 flags &= ~IP_VS_CONN_F_HASHED;
975 if (flags & IP_VS_CONN_F_SEQ_MASK) {
976 opt = (struct ip_vs_sync_conn_options *)&s[1];
977 p += FULL_CONN_SIZE;
978 if (p > buffer+buflen) {
979 IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n");
980 return;
981 }
982 } else {
983 opt = NULL;
984 p += SIMPLE_CONN_SIZE;
985 }
986
987 state = ntohs(s->state);
988 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
989 pp = ip_vs_proto_get(s->protocol);
990 if (!pp) {
991 IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n",
992 s->protocol);
993 continue;
994 }
995 if (state >= pp->num_states) {
996 IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n",
997 pp->name, state);
998 continue;
999 }
1000 } else {
1001 /* protocol in templates is not used for state/timeout */
1002 if (state > 0) {
1003 IP_VS_DBG(2, "BACKUP v0, Invalid template state %u\n",
1004 state);
1005 state = 0;
1006 }
1007 }
1008
1009 ip_vs_conn_fill_param(ipvs, AF_INET, s->protocol,
1010 (const union nf_inet_addr *)&s->caddr,
1011 s->cport,
1012 (const union nf_inet_addr *)&s->vaddr,
1013 s->vport, &param);
1014
1015 /* Send timeout as Zero */
1016 ip_vs_proc_conn(ipvs, &param, flags, state, s->protocol, AF_INET,
1017 (union nf_inet_addr *)&s->daddr, s->dport,
1018 0, 0, opt);
1019 }
1020 }
1021
1022 /*
1023 * Handle options
1024 */
1025 static inline int ip_vs_proc_seqopt(__u8 *p, unsigned int plen,
1026 __u32 *opt_flags,
1027 struct ip_vs_sync_conn_options *opt)
1028 {
1029 struct ip_vs_sync_conn_options *topt;
1030
1031 topt = (struct ip_vs_sync_conn_options *)p;
1032
1033 if (plen != sizeof(struct ip_vs_sync_conn_options)) {
1034 IP_VS_DBG(2, "BACKUP, bogus conn options length\n");
1035 return -EINVAL;
1036 }
1037 if (*opt_flags & IPVS_OPT_F_SEQ_DATA) {
1038 IP_VS_DBG(2, "BACKUP, conn options found twice\n");
1039 return -EINVAL;
1040 }
1041 ntoh_seq(&topt->in_seq, &opt->in_seq);
1042 ntoh_seq(&topt->out_seq, &opt->out_seq);
1043 *opt_flags |= IPVS_OPT_F_SEQ_DATA;
1044 return 0;
1045 }
1046
1047 static int ip_vs_proc_str(__u8 *p, unsigned int plen, unsigned int *data_len,
1048 __u8 **data, unsigned int maxlen,
1049 __u32 *opt_flags, __u32 flag)
1050 {
1051 if (plen > maxlen) {
1052 IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen);
1053 return -EINVAL;
1054 }
1055 if (*opt_flags & flag) {
1056 IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag);
1057 return -EINVAL;
1058 }
1059 *data_len = plen;
1060 *data = p;
1061 *opt_flags |= flag;
1062 return 0;
1063 }
1064 /*
1065 * Process a Version 1 sync. connection
1066 */
1067 static inline int ip_vs_proc_sync_conn(struct netns_ipvs *ipvs, __u8 *p, __u8 *msg_end)
1068 {
1069 struct ip_vs_sync_conn_options opt;
1070 union ip_vs_sync_conn *s;
1071 struct ip_vs_protocol *pp;
1072 struct ip_vs_conn_param param;
1073 __u32 flags;
1074 unsigned int af, state, pe_data_len=0, pe_name_len=0;
1075 __u8 *pe_data=NULL, *pe_name=NULL;
1076 __u32 opt_flags=0;
1077 int retc=0;
1078
1079 s = (union ip_vs_sync_conn *) p;
1080
1081 if (s->v6.type & STYPE_F_INET6) {
1082 #ifdef CONFIG_IP_VS_IPV6
1083 af = AF_INET6;
1084 p += sizeof(struct ip_vs_sync_v6);
1085 #else
1086 IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n");
1087 retc = 10;
1088 goto out;
1089 #endif
1090 } else if (!s->v4.type) {
1091 af = AF_INET;
1092 p += sizeof(struct ip_vs_sync_v4);
1093 } else {
1094 return -10;
1095 }
1096 if (p > msg_end)
1097 return -20;
1098
1099 /* Process optional params check Type & Len. */
1100 while (p < msg_end) {
1101 int ptype;
1102 int plen;
1103
1104 if (p+2 > msg_end)
1105 return -30;
1106 ptype = *(p++);
1107 plen = *(p++);
1108
1109 if (!plen || ((p + plen) > msg_end))
1110 return -40;
1111 /* Handle seq option p = param data */
1112 switch (ptype & ~IPVS_OPT_F_PARAM) {
1113 case IPVS_OPT_SEQ_DATA:
1114 if (ip_vs_proc_seqopt(p, plen, &opt_flags, &opt))
1115 return -50;
1116 break;
1117
1118 case IPVS_OPT_PE_DATA:
1119 if (ip_vs_proc_str(p, plen, &pe_data_len, &pe_data,
1120 IP_VS_PEDATA_MAXLEN, &opt_flags,
1121 IPVS_OPT_F_PE_DATA))
1122 return -60;
1123 break;
1124
1125 case IPVS_OPT_PE_NAME:
1126 if (ip_vs_proc_str(p, plen,&pe_name_len, &pe_name,
1127 IP_VS_PENAME_MAXLEN, &opt_flags,
1128 IPVS_OPT_F_PE_NAME))
1129 return -70;
1130 break;
1131
1132 default:
1133 /* Param data mandatory ? */
1134 if (!(ptype & IPVS_OPT_F_PARAM)) {
1135 IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n",
1136 ptype & ~IPVS_OPT_F_PARAM);
1137 retc = 20;
1138 goto out;
1139 }
1140 }
1141 p += plen; /* Next option */
1142 }
1143
1144 /* Get flags and Mask off unsupported */
1145 flags = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK;
1146 flags |= IP_VS_CONN_F_SYNC;
1147 state = ntohs(s->v4.state);
1148
1149 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
1150 pp = ip_vs_proto_get(s->v4.protocol);
1151 if (!pp) {
1152 IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n",
1153 s->v4.protocol);
1154 retc = 30;
1155 goto out;
1156 }
1157 if (state >= pp->num_states) {
1158 IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n",
1159 pp->name, state);
1160 retc = 40;
1161 goto out;
1162 }
1163 } else {
1164 /* protocol in templates is not used for state/timeout */
1165 if (state > 0) {
1166 IP_VS_DBG(3, "BACKUP, Invalid template state %u\n",
1167 state);
1168 state = 0;
1169 }
1170 }
1171 if (ip_vs_conn_fill_param_sync(ipvs, af, s, &param, pe_data,
1172 pe_data_len, pe_name, pe_name_len)) {
1173 retc = 50;
1174 goto out;
1175 }
1176 /* If only IPv4, just silent skip IPv6 */
1177 if (af == AF_INET)
1178 ip_vs_proc_conn(ipvs, &param, flags, state, s->v4.protocol, af,
1179 (union nf_inet_addr *)&s->v4.daddr, s->v4.dport,
1180 ntohl(s->v4.timeout), ntohl(s->v4.fwmark),
1181 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1182 );
1183 #ifdef CONFIG_IP_VS_IPV6
1184 else
1185 ip_vs_proc_conn(ipvs, &param, flags, state, s->v6.protocol, af,
1186 (union nf_inet_addr *)&s->v6.daddr, s->v6.dport,
1187 ntohl(s->v6.timeout), ntohl(s->v6.fwmark),
1188 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1189 );
1190 #endif
1191 ip_vs_pe_put(param.pe);
1192 return 0;
1193 /* Error exit */
1194 out:
1195 IP_VS_DBG(2, "BACKUP, Single msg dropped err:%d\n", retc);
1196 return retc;
1197
1198 }
1199 /*
1200 * Process received multicast message and create the corresponding
1201 * ip_vs_conn entries.
1202 * Handles Version 0 & 1
1203 */
1204 static void ip_vs_process_message(struct netns_ipvs *ipvs, __u8 *buffer,
1205 const size_t buflen)
1206 {
1207 struct ip_vs_sync_mesg *m2 = (struct ip_vs_sync_mesg *)buffer;
1208 __u8 *p, *msg_end;
1209 int i, nr_conns;
1210
1211 if (buflen < sizeof(struct ip_vs_sync_mesg_v0)) {
1212 IP_VS_DBG(2, "BACKUP, message header too short\n");
1213 return;
1214 }
1215
1216 if (buflen != ntohs(m2->size)) {
1217 IP_VS_DBG(2, "BACKUP, bogus message size\n");
1218 return;
1219 }
1220 /* SyncID sanity check */
1221 if (ipvs->bcfg.syncid != 0 && m2->syncid != ipvs->bcfg.syncid) {
1222 IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid);
1223 return;
1224 }
1225 /* Handle version 1 message */
1226 if ((m2->version == SYNC_PROTO_VER) && (m2->reserved == 0)
1227 && (m2->spare == 0)) {
1228
1229 msg_end = buffer + sizeof(struct ip_vs_sync_mesg);
1230 nr_conns = m2->nr_conns;
1231
1232 for (i=0; i<nr_conns; i++) {
1233 union ip_vs_sync_conn *s;
1234 unsigned int size;
1235 int retc;
1236
1237 p = msg_end;
1238 if (p + sizeof(s->v4) > buffer+buflen) {
1239 IP_VS_ERR_RL("BACKUP, Dropping buffer, to small\n");
1240 return;
1241 }
1242 s = (union ip_vs_sync_conn *)p;
1243 size = ntohs(s->v4.ver_size) & SVER_MASK;
1244 msg_end = p + size;
1245 /* Basic sanity checks */
1246 if (msg_end > buffer+buflen) {
1247 IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n");
1248 return;
1249 }
1250 if (ntohs(s->v4.ver_size) >> SVER_SHIFT) {
1251 IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n",
1252 ntohs(s->v4.ver_size) >> SVER_SHIFT);
1253 return;
1254 }
1255 /* Process a single sync_conn */
1256 retc = ip_vs_proc_sync_conn(ipvs, p, msg_end);
1257 if (retc < 0) {
1258 IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n",
1259 retc);
1260 return;
1261 }
1262 /* Make sure we have 32 bit alignment */
1263 msg_end = p + ((size + 3) & ~3);
1264 }
1265 } else {
1266 /* Old type of message */
1267 ip_vs_process_message_v0(ipvs, buffer, buflen);
1268 return;
1269 }
1270 }
1271
1272
1273 /*
1274 * Setup sndbuf (mode=1) or rcvbuf (mode=0)
1275 */
1276 static void set_sock_size(struct sock *sk, int mode, int val)
1277 {
1278 /* setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)); */
1279 /* setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)); */
1280 lock_sock(sk);
1281 if (mode) {
1282 val = clamp_t(int, val, (SOCK_MIN_SNDBUF + 1) / 2,
1283 sysctl_wmem_max);
1284 sk->sk_sndbuf = val * 2;
1285 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1286 } else {
1287 val = clamp_t(int, val, (SOCK_MIN_RCVBUF + 1) / 2,
1288 sysctl_rmem_max);
1289 sk->sk_rcvbuf = val * 2;
1290 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1291 }
1292 release_sock(sk);
1293 }
1294
1295 /*
1296 * Setup loopback of outgoing multicasts on a sending socket
1297 */
1298 static void set_mcast_loop(struct sock *sk, u_char loop)
1299 {
1300 struct inet_sock *inet = inet_sk(sk);
1301
1302 /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */
1303 lock_sock(sk);
1304 inet->mc_loop = loop ? 1 : 0;
1305 #ifdef CONFIG_IP_VS_IPV6
1306 if (sk->sk_family == AF_INET6) {
1307 struct ipv6_pinfo *np = inet6_sk(sk);
1308
1309 /* IPV6_MULTICAST_LOOP */
1310 np->mc_loop = loop ? 1 : 0;
1311 }
1312 #endif
1313 release_sock(sk);
1314 }
1315
1316 /*
1317 * Specify TTL for outgoing multicasts on a sending socket
1318 */
1319 static void set_mcast_ttl(struct sock *sk, u_char ttl)
1320 {
1321 struct inet_sock *inet = inet_sk(sk);
1322
1323 /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */
1324 lock_sock(sk);
1325 inet->mc_ttl = ttl;
1326 #ifdef CONFIG_IP_VS_IPV6
1327 if (sk->sk_family == AF_INET6) {
1328 struct ipv6_pinfo *np = inet6_sk(sk);
1329
1330 /* IPV6_MULTICAST_HOPS */
1331 np->mcast_hops = ttl;
1332 }
1333 #endif
1334 release_sock(sk);
1335 }
1336
1337 /* Control fragmentation of messages */
1338 static void set_mcast_pmtudisc(struct sock *sk, int val)
1339 {
1340 struct inet_sock *inet = inet_sk(sk);
1341
1342 /* setsockopt(sock, SOL_IP, IP_MTU_DISCOVER, &val, sizeof(val)); */
1343 lock_sock(sk);
1344 inet->pmtudisc = val;
1345 #ifdef CONFIG_IP_VS_IPV6
1346 if (sk->sk_family == AF_INET6) {
1347 struct ipv6_pinfo *np = inet6_sk(sk);
1348
1349 /* IPV6_MTU_DISCOVER */
1350 np->pmtudisc = val;
1351 }
1352 #endif
1353 release_sock(sk);
1354 }
1355
1356 /*
1357 * Specifiy default interface for outgoing multicasts
1358 */
1359 static int set_mcast_if(struct sock *sk, char *ifname)
1360 {
1361 struct net_device *dev;
1362 struct inet_sock *inet = inet_sk(sk);
1363 struct net *net = sock_net(sk);
1364
1365 dev = __dev_get_by_name(net, ifname);
1366 if (!dev)
1367 return -ENODEV;
1368
1369 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1370 return -EINVAL;
1371
1372 lock_sock(sk);
1373 inet->mc_index = dev->ifindex;
1374 /* inet->mc_addr = 0; */
1375 #ifdef CONFIG_IP_VS_IPV6
1376 if (sk->sk_family == AF_INET6) {
1377 struct ipv6_pinfo *np = inet6_sk(sk);
1378
1379 /* IPV6_MULTICAST_IF */
1380 np->mcast_oif = dev->ifindex;
1381 }
1382 #endif
1383 release_sock(sk);
1384
1385 return 0;
1386 }
1387
1388
1389 /*
1390 * Join a multicast group.
1391 * the group is specified by a class D multicast address 224.0.0.0/8
1392 * in the in_addr structure passed in as a parameter.
1393 */
1394 static int
1395 join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname)
1396 {
1397 struct net *net = sock_net(sk);
1398 struct ip_mreqn mreq;
1399 struct net_device *dev;
1400 int ret;
1401
1402 memset(&mreq, 0, sizeof(mreq));
1403 memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr));
1404
1405 dev = __dev_get_by_name(net, ifname);
1406 if (!dev)
1407 return -ENODEV;
1408 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1409 return -EINVAL;
1410
1411 mreq.imr_ifindex = dev->ifindex;
1412
1413 lock_sock(sk);
1414 ret = ip_mc_join_group(sk, &mreq);
1415 release_sock(sk);
1416
1417 return ret;
1418 }
1419
1420 #ifdef CONFIG_IP_VS_IPV6
1421 static int join_mcast_group6(struct sock *sk, struct in6_addr *addr,
1422 char *ifname)
1423 {
1424 struct net *net = sock_net(sk);
1425 struct net_device *dev;
1426 int ret;
1427
1428 dev = __dev_get_by_name(net, ifname);
1429 if (!dev)
1430 return -ENODEV;
1431 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1432 return -EINVAL;
1433
1434 lock_sock(sk);
1435 ret = ipv6_sock_mc_join(sk, dev->ifindex, addr);
1436 release_sock(sk);
1437
1438 return ret;
1439 }
1440 #endif
1441
1442 static int bind_mcastif_addr(struct socket *sock, char *ifname)
1443 {
1444 struct net *net = sock_net(sock->sk);
1445 struct net_device *dev;
1446 __be32 addr;
1447 struct sockaddr_in sin;
1448
1449 dev = __dev_get_by_name(net, ifname);
1450 if (!dev)
1451 return -ENODEV;
1452
1453 addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
1454 if (!addr)
1455 pr_err("You probably need to specify IP address on "
1456 "multicast interface.\n");
1457
1458 IP_VS_DBG(7, "binding socket with (%s) %pI4\n",
1459 ifname, &addr);
1460
1461 /* Now bind the socket with the address of multicast interface */
1462 sin.sin_family = AF_INET;
1463 sin.sin_addr.s_addr = addr;
1464 sin.sin_port = 0;
1465
1466 return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin));
1467 }
1468
1469 static void get_mcast_sockaddr(union ipvs_sockaddr *sa, int *salen,
1470 struct ipvs_sync_daemon_cfg *c, int id)
1471 {
1472 if (AF_INET6 == c->mcast_af) {
1473 sa->in6 = (struct sockaddr_in6) {
1474 .sin6_family = AF_INET6,
1475 .sin6_port = htons(c->mcast_port + id),
1476 };
1477 sa->in6.sin6_addr = c->mcast_group.in6;
1478 *salen = sizeof(sa->in6);
1479 } else {
1480 sa->in = (struct sockaddr_in) {
1481 .sin_family = AF_INET,
1482 .sin_port = htons(c->mcast_port + id),
1483 };
1484 sa->in.sin_addr = c->mcast_group.in;
1485 *salen = sizeof(sa->in);
1486 }
1487 }
1488
1489 /*
1490 * Set up sending multicast socket over UDP
1491 */
1492 static struct socket *make_send_sock(struct netns_ipvs *ipvs, int id)
1493 {
1494 /* multicast addr */
1495 union ipvs_sockaddr mcast_addr;
1496 struct socket *sock;
1497 int result, salen;
1498
1499 /* First create a socket */
1500 result = sock_create_kern(ipvs->net, ipvs->mcfg.mcast_af, SOCK_DGRAM,
1501 IPPROTO_UDP, &sock);
1502 if (result < 0) {
1503 pr_err("Error during creation of socket; terminating\n");
1504 return ERR_PTR(result);
1505 }
1506 result = set_mcast_if(sock->sk, ipvs->mcfg.mcast_ifn);
1507 if (result < 0) {
1508 pr_err("Error setting outbound mcast interface\n");
1509 goto error;
1510 }
1511
1512 set_mcast_loop(sock->sk, 0);
1513 set_mcast_ttl(sock->sk, ipvs->mcfg.mcast_ttl);
1514 /* Allow fragmentation if MTU changes */
1515 set_mcast_pmtudisc(sock->sk, IP_PMTUDISC_DONT);
1516 result = sysctl_sync_sock_size(ipvs);
1517 if (result > 0)
1518 set_sock_size(sock->sk, 1, result);
1519
1520 if (AF_INET == ipvs->mcfg.mcast_af)
1521 result = bind_mcastif_addr(sock, ipvs->mcfg.mcast_ifn);
1522 else
1523 result = 0;
1524 if (result < 0) {
1525 pr_err("Error binding address of the mcast interface\n");
1526 goto error;
1527 }
1528
1529 get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->mcfg, id);
1530 result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr,
1531 salen, 0);
1532 if (result < 0) {
1533 pr_err("Error connecting to the multicast addr\n");
1534 goto error;
1535 }
1536
1537 return sock;
1538
1539 error:
1540 sock_release(sock);
1541 return ERR_PTR(result);
1542 }
1543
1544
1545 /*
1546 * Set up receiving multicast socket over UDP
1547 */
1548 static struct socket *make_receive_sock(struct netns_ipvs *ipvs, int id)
1549 {
1550 /* multicast addr */
1551 union ipvs_sockaddr mcast_addr;
1552 struct socket *sock;
1553 int result, salen;
1554
1555 /* First create a socket */
1556 result = sock_create_kern(ipvs->net, ipvs->bcfg.mcast_af, SOCK_DGRAM,
1557 IPPROTO_UDP, &sock);
1558 if (result < 0) {
1559 pr_err("Error during creation of socket; terminating\n");
1560 return ERR_PTR(result);
1561 }
1562 /* it is equivalent to the REUSEADDR option in user-space */
1563 sock->sk->sk_reuse = SK_CAN_REUSE;
1564 result = sysctl_sync_sock_size(ipvs);
1565 if (result > 0)
1566 set_sock_size(sock->sk, 0, result);
1567
1568 get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->bcfg, id);
1569 result = sock->ops->bind(sock, (struct sockaddr *)&mcast_addr, salen);
1570 if (result < 0) {
1571 pr_err("Error binding to the multicast addr\n");
1572 goto error;
1573 }
1574
1575 /* join the multicast group */
1576 #ifdef CONFIG_IP_VS_IPV6
1577 if (ipvs->bcfg.mcast_af == AF_INET6)
1578 result = join_mcast_group6(sock->sk, &mcast_addr.in6.sin6_addr,
1579 ipvs->bcfg.mcast_ifn);
1580 else
1581 #endif
1582 result = join_mcast_group(sock->sk, &mcast_addr.in.sin_addr,
1583 ipvs->bcfg.mcast_ifn);
1584 if (result < 0) {
1585 pr_err("Error joining to the multicast group\n");
1586 goto error;
1587 }
1588
1589 return sock;
1590
1591 error:
1592 sock_release(sock);
1593 return ERR_PTR(result);
1594 }
1595
1596
1597 static int
1598 ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length)
1599 {
1600 struct msghdr msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL};
1601 struct kvec iov;
1602 int len;
1603
1604 EnterFunction(7);
1605 iov.iov_base = (void *)buffer;
1606 iov.iov_len = length;
1607
1608 len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length));
1609
1610 LeaveFunction(7);
1611 return len;
1612 }
1613
1614 static int
1615 ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg)
1616 {
1617 int msize;
1618 int ret;
1619
1620 msize = ntohs(msg->size);
1621
1622 ret = ip_vs_send_async(sock, (char *)msg, msize);
1623 if (ret >= 0 || ret == -EAGAIN)
1624 return ret;
1625 pr_err("ip_vs_send_async error %d\n", ret);
1626 return 0;
1627 }
1628
1629 static int
1630 ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
1631 {
1632 struct msghdr msg = {NULL,};
1633 struct kvec iov;
1634 int len;
1635
1636 EnterFunction(7);
1637
1638 /* Receive a packet */
1639 iov.iov_base = buffer;
1640 iov.iov_len = (size_t)buflen;
1641
1642 len = kernel_recvmsg(sock, &msg, &iov, 1, buflen, MSG_DONTWAIT);
1643
1644 if (len < 0)
1645 return len;
1646
1647 LeaveFunction(7);
1648 return len;
1649 }
1650
1651 /* Wakeup the master thread for sending */
1652 static void master_wakeup_work_handler(struct work_struct *work)
1653 {
1654 struct ipvs_master_sync_state *ms =
1655 container_of(work, struct ipvs_master_sync_state,
1656 master_wakeup_work.work);
1657 struct netns_ipvs *ipvs = ms->ipvs;
1658
1659 spin_lock_bh(&ipvs->sync_lock);
1660 if (ms->sync_queue_len &&
1661 ms->sync_queue_delay < IPVS_SYNC_WAKEUP_RATE) {
1662 ms->sync_queue_delay = IPVS_SYNC_WAKEUP_RATE;
1663 wake_up_process(ms->master_thread);
1664 }
1665 spin_unlock_bh(&ipvs->sync_lock);
1666 }
1667
1668 /* Get next buffer to send */
1669 static inline struct ip_vs_sync_buff *
1670 next_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
1671 {
1672 struct ip_vs_sync_buff *sb;
1673
1674 sb = sb_dequeue(ipvs, ms);
1675 if (sb)
1676 return sb;
1677 /* Do not delay entries in buffer for more than 2 seconds */
1678 return get_curr_sync_buff(ipvs, ms, IPVS_SYNC_FLUSH_TIME);
1679 }
1680
1681 static int sync_thread_master(void *data)
1682 {
1683 struct ip_vs_sync_thread_data *tinfo = data;
1684 struct netns_ipvs *ipvs = tinfo->ipvs;
1685 struct ipvs_master_sync_state *ms = &ipvs->ms[tinfo->id];
1686 struct sock *sk = tinfo->sock->sk;
1687 struct ip_vs_sync_buff *sb;
1688
1689 pr_info("sync thread started: state = MASTER, mcast_ifn = %s, "
1690 "syncid = %d, id = %d\n",
1691 ipvs->mcfg.mcast_ifn, ipvs->mcfg.syncid, tinfo->id);
1692
1693 for (;;) {
1694 sb = next_sync_buff(ipvs, ms);
1695 if (unlikely(kthread_should_stop()))
1696 break;
1697 if (!sb) {
1698 schedule_timeout(IPVS_SYNC_CHECK_PERIOD);
1699 continue;
1700 }
1701 while (ip_vs_send_sync_msg(tinfo->sock, sb->mesg) < 0) {
1702 /* (Ab)use interruptible sleep to avoid increasing
1703 * the load avg.
1704 */
1705 __wait_event_interruptible(*sk_sleep(sk),
1706 sock_writeable(sk) ||
1707 kthread_should_stop());
1708 if (unlikely(kthread_should_stop()))
1709 goto done;
1710 }
1711 ip_vs_sync_buff_release(sb);
1712 }
1713
1714 done:
1715 __set_current_state(TASK_RUNNING);
1716 if (sb)
1717 ip_vs_sync_buff_release(sb);
1718
1719 /* clean up the sync_buff queue */
1720 while ((sb = sb_dequeue(ipvs, ms)))
1721 ip_vs_sync_buff_release(sb);
1722 __set_current_state(TASK_RUNNING);
1723
1724 /* clean up the current sync_buff */
1725 sb = get_curr_sync_buff(ipvs, ms, 0);
1726 if (sb)
1727 ip_vs_sync_buff_release(sb);
1728
1729 /* release the sending multicast socket */
1730 sock_release(tinfo->sock);
1731 kfree(tinfo);
1732
1733 return 0;
1734 }
1735
1736
1737 static int sync_thread_backup(void *data)
1738 {
1739 struct ip_vs_sync_thread_data *tinfo = data;
1740 struct netns_ipvs *ipvs = tinfo->ipvs;
1741 int len;
1742
1743 pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
1744 "syncid = %d, id = %d\n",
1745 ipvs->bcfg.mcast_ifn, ipvs->bcfg.syncid, tinfo->id);
1746
1747 while (!kthread_should_stop()) {
1748 wait_event_interruptible(*sk_sleep(tinfo->sock->sk),
1749 !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue)
1750 || kthread_should_stop());
1751
1752 /* do we have data now? */
1753 while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
1754 len = ip_vs_receive(tinfo->sock, tinfo->buf,
1755 ipvs->bcfg.sync_maxlen);
1756 if (len <= 0) {
1757 if (len != -EAGAIN)
1758 pr_err("receiving message error\n");
1759 break;
1760 }
1761
1762 ip_vs_process_message(ipvs, tinfo->buf, len);
1763 }
1764 }
1765
1766 /* release the sending multicast socket */
1767 sock_release(tinfo->sock);
1768 kfree(tinfo->buf);
1769 kfree(tinfo);
1770
1771 return 0;
1772 }
1773
1774
1775 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c,
1776 int state)
1777 {
1778 struct ip_vs_sync_thread_data *tinfo;
1779 struct task_struct **array = NULL, *task;
1780 struct socket *sock;
1781 struct net_device *dev;
1782 char *name;
1783 int (*threadfn)(void *data);
1784 int id, count, hlen;
1785 int result = -ENOMEM;
1786 u16 mtu, min_mtu;
1787
1788 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1789 IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n",
1790 sizeof(struct ip_vs_sync_conn_v0));
1791
1792 if (!ipvs->sync_state) {
1793 count = clamp(sysctl_sync_ports(ipvs), 1, IPVS_SYNC_PORTS_MAX);
1794 ipvs->threads_mask = count - 1;
1795 } else
1796 count = ipvs->threads_mask + 1;
1797
1798 if (c->mcast_af == AF_UNSPEC) {
1799 c->mcast_af = AF_INET;
1800 c->mcast_group.ip = cpu_to_be32(IP_VS_SYNC_GROUP);
1801 }
1802 if (!c->mcast_port)
1803 c->mcast_port = IP_VS_SYNC_PORT;
1804 if (!c->mcast_ttl)
1805 c->mcast_ttl = 1;
1806
1807 dev = __dev_get_by_name(ipvs->net, c->mcast_ifn);
1808 if (!dev) {
1809 pr_err("Unknown mcast interface: %s\n", c->mcast_ifn);
1810 return -ENODEV;
1811 }
1812 hlen = (AF_INET6 == c->mcast_af) ?
1813 sizeof(struct ipv6hdr) + sizeof(struct udphdr) :
1814 sizeof(struct iphdr) + sizeof(struct udphdr);
1815 mtu = (state == IP_VS_STATE_BACKUP) ?
1816 clamp(dev->mtu, 1500U, 65535U) : 1500U;
1817 min_mtu = (state == IP_VS_STATE_BACKUP) ? 1024 : 1;
1818
1819 if (c->sync_maxlen)
1820 c->sync_maxlen = clamp_t(unsigned int,
1821 c->sync_maxlen, min_mtu,
1822 65535 - hlen);
1823 else
1824 c->sync_maxlen = mtu - hlen;
1825
1826 if (state == IP_VS_STATE_MASTER) {
1827 if (ipvs->ms)
1828 return -EEXIST;
1829
1830 ipvs->mcfg = *c;
1831 name = "ipvs-m:%d:%d";
1832 threadfn = sync_thread_master;
1833 } else if (state == IP_VS_STATE_BACKUP) {
1834 if (ipvs->backup_threads)
1835 return -EEXIST;
1836
1837 ipvs->bcfg = *c;
1838 name = "ipvs-b:%d:%d";
1839 threadfn = sync_thread_backup;
1840 } else {
1841 return -EINVAL;
1842 }
1843
1844 if (state == IP_VS_STATE_MASTER) {
1845 struct ipvs_master_sync_state *ms;
1846
1847 ipvs->ms = kzalloc(count * sizeof(ipvs->ms[0]), GFP_KERNEL);
1848 if (!ipvs->ms)
1849 goto out;
1850 ms = ipvs->ms;
1851 for (id = 0; id < count; id++, ms++) {
1852 INIT_LIST_HEAD(&ms->sync_queue);
1853 ms->sync_queue_len = 0;
1854 ms->sync_queue_delay = 0;
1855 INIT_DELAYED_WORK(&ms->master_wakeup_work,
1856 master_wakeup_work_handler);
1857 ms->ipvs = ipvs;
1858 }
1859 } else {
1860 array = kzalloc(count * sizeof(struct task_struct *),
1861 GFP_KERNEL);
1862 if (!array)
1863 goto out;
1864 }
1865
1866 tinfo = NULL;
1867 for (id = 0; id < count; id++) {
1868 if (state == IP_VS_STATE_MASTER)
1869 sock = make_send_sock(ipvs, id);
1870 else
1871 sock = make_receive_sock(ipvs, id);
1872 if (IS_ERR(sock)) {
1873 result = PTR_ERR(sock);
1874 goto outtinfo;
1875 }
1876 tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL);
1877 if (!tinfo)
1878 goto outsocket;
1879 tinfo->ipvs = ipvs;
1880 tinfo->sock = sock;
1881 if (state == IP_VS_STATE_BACKUP) {
1882 tinfo->buf = kmalloc(ipvs->bcfg.sync_maxlen,
1883 GFP_KERNEL);
1884 if (!tinfo->buf)
1885 goto outtinfo;
1886 } else {
1887 tinfo->buf = NULL;
1888 }
1889 tinfo->id = id;
1890
1891 task = kthread_run(threadfn, tinfo, name, ipvs->gen, id);
1892 if (IS_ERR(task)) {
1893 result = PTR_ERR(task);
1894 goto outtinfo;
1895 }
1896 tinfo = NULL;
1897 if (state == IP_VS_STATE_MASTER)
1898 ipvs->ms[id].master_thread = task;
1899 else
1900 array[id] = task;
1901 }
1902
1903 /* mark as active */
1904
1905 if (state == IP_VS_STATE_BACKUP)
1906 ipvs->backup_threads = array;
1907 spin_lock_bh(&ipvs->sync_buff_lock);
1908 ipvs->sync_state |= state;
1909 spin_unlock_bh(&ipvs->sync_buff_lock);
1910
1911 /* increase the module use count */
1912 ip_vs_use_count_inc();
1913
1914 return 0;
1915
1916 outsocket:
1917 sock_release(sock);
1918
1919 outtinfo:
1920 if (tinfo) {
1921 sock_release(tinfo->sock);
1922 kfree(tinfo->buf);
1923 kfree(tinfo);
1924 }
1925 count = id;
1926 while (count-- > 0) {
1927 if (state == IP_VS_STATE_MASTER)
1928 kthread_stop(ipvs->ms[count].master_thread);
1929 else
1930 kthread_stop(array[count]);
1931 }
1932 kfree(array);
1933
1934 out:
1935 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
1936 kfree(ipvs->ms);
1937 ipvs->ms = NULL;
1938 }
1939 return result;
1940 }
1941
1942
1943 int stop_sync_thread(struct netns_ipvs *ipvs, int state)
1944 {
1945 struct task_struct **array;
1946 int id;
1947 int retc = -EINVAL;
1948
1949 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1950
1951 if (state == IP_VS_STATE_MASTER) {
1952 if (!ipvs->ms)
1953 return -ESRCH;
1954
1955 /*
1956 * The lock synchronizes with sb_queue_tail(), so that we don't
1957 * add sync buffers to the queue, when we are already in
1958 * progress of stopping the master sync daemon.
1959 */
1960
1961 spin_lock_bh(&ipvs->sync_buff_lock);
1962 spin_lock(&ipvs->sync_lock);
1963 ipvs->sync_state &= ~IP_VS_STATE_MASTER;
1964 spin_unlock(&ipvs->sync_lock);
1965 spin_unlock_bh(&ipvs->sync_buff_lock);
1966
1967 retc = 0;
1968 for (id = ipvs->threads_mask; id >= 0; id--) {
1969 struct ipvs_master_sync_state *ms = &ipvs->ms[id];
1970 int ret;
1971
1972 pr_info("stopping master sync thread %d ...\n",
1973 task_pid_nr(ms->master_thread));
1974 cancel_delayed_work_sync(&ms->master_wakeup_work);
1975 ret = kthread_stop(ms->master_thread);
1976 if (retc >= 0)
1977 retc = ret;
1978 }
1979 kfree(ipvs->ms);
1980 ipvs->ms = NULL;
1981 } else if (state == IP_VS_STATE_BACKUP) {
1982 if (!ipvs->backup_threads)
1983 return -ESRCH;
1984
1985 ipvs->sync_state &= ~IP_VS_STATE_BACKUP;
1986 array = ipvs->backup_threads;
1987 retc = 0;
1988 for (id = ipvs->threads_mask; id >= 0; id--) {
1989 int ret;
1990
1991 pr_info("stopping backup sync thread %d ...\n",
1992 task_pid_nr(array[id]));
1993 ret = kthread_stop(array[id]);
1994 if (retc >= 0)
1995 retc = ret;
1996 }
1997 kfree(array);
1998 ipvs->backup_threads = NULL;
1999 }
2000
2001 /* decrease the module use count */
2002 ip_vs_use_count_dec();
2003
2004 return retc;
2005 }
2006
2007 /*
2008 * Initialize data struct for each netns
2009 */
2010 int __net_init ip_vs_sync_net_init(struct netns_ipvs *ipvs)
2011 {
2012 __mutex_init(&ipvs->sync_mutex, "ipvs->sync_mutex", &__ipvs_sync_key);
2013 spin_lock_init(&ipvs->sync_lock);
2014 spin_lock_init(&ipvs->sync_buff_lock);
2015 return 0;
2016 }
2017
2018 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs)
2019 {
2020 int retc;
2021
2022 mutex_lock(&ipvs->sync_mutex);
2023 retc = stop_sync_thread(ipvs, IP_VS_STATE_MASTER);
2024 if (retc && retc != -ESRCH)
2025 pr_err("Failed to stop Master Daemon\n");
2026
2027 retc = stop_sync_thread(ipvs, IP_VS_STATE_BACKUP);
2028 if (retc && retc != -ESRCH)
2029 pr_err("Failed to stop Backup Daemon\n");
2030 mutex_unlock(&ipvs->sync_mutex);
2031 }
Linux kernel - Deliverables
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